See, I am sort of conflicted about Andrea and his jet-setting...on the one hand he is young and rich and beautiful and aristo, so it's quite natural for him to go to parties and lie around on the beach while he is still in his "golden youth".
But he also has a serious side...he has had the same girlfriend for years and appears devoted to her. No hints of fooling around with other women a la Harry of Wales. Also the recent article in Vanity Fair featuring Andrea and Tatiana and their adorable little dog Daphne told of a serious, sensitive bright young man...for example I had no idea that he had spent several months teaching in the Third World, and was interested in AMADE(Princess Caroline's charity for underprivileged children Third World countries.)
All of the Casiraghi children seem more or less devoted to the "good life". Unlike her brother Andrea, I don't get the feeling Charlotte cares a fig about ANY charity or social cause. Pierre is still a student and even though he has settled into a contented domestic routine with Beatrice, he also has quite an active social life as well.
And I don't think the late Stefano Casiraghi would have been much of sobering influence. It was a tragic loss for them to lose their father young, but from what I remember of Stefano he had a taste for the high life too....he liked speedboats, flashy cars and beautiful well connected women, he had good sound business sense that Rainier grew to appreciate, but I never would have taken Stefano for a work horse or social activist.
Andrea is still young. Give him time.